Key Issue 2
Which three measures do geographers use to study population change? Geographers use Crude birth rate (CBR), Crude death rate (CDR), and Natural Increase rate (NIR). CBR is the total number of live births in a year for every 1,000 people alive in society. CDR is the total number of deaths in a year for every 1,000 people alive in the society. NIR is the percentage by which a population grows in a year. Is a small change in the NIR important?
Even if the NIR changed by 0.2%, the doubling time would change. The doubling time is the number of years needed to double a population. For NIR to be 2.2%, the doubling time would be 35 years. Why is most of the world’s population growth in LDC’s?
Parents usually have more babies in LDCs to help them with farming and chores and because sometime not all will live to adulthood. Does TFR vary in different parts of the world? Total fertility rate (TFR) are used by geographers to measure the number of births in a society. According to Figure 2-11 on page 55 of our textbook, the Fertility rate of 4.0 and above are mostly in Africa. The Fertility rate of 3.0 – 3.9 is mostly located in Asia and South America. Is the IMR pattern similar to others? The Infant mortality rate (IMR) is the annual number of deaths of infants under 1 year of age, compared with total live births. The pattern of IMR is most similar to CBR and TFR. Why does the IMR reflect a country’s health care system? Lower IMRs are found in countries with well-trained doctors and nurses, modern hospitals, and large supplies of medicine. Ex – Western Europe
How does life expectancy follow the same trend? It is the most favorable in the wealthy countries of western Europe and at least favorable in the pour countries of sub Saharan Africa. Key Issue 3
Why does every country go through the demographic transition at different times? Depending on the amount of food that a country gets and how it gets it. (hunting + gathering -> agricultural revolution...
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